Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (4): 75-80.doi: 10.3969/j.issn.1673-8926.2011.04.013

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Characteristics and controlling factors of E1+2 clastic reservoir in Qie 6 block of Kunbei Oilfield in Qaidam Basin

LI Le1， MU Zhonghai1， WANG Liqun2， XU Feng2   

  1. 1. Southwest Petroleum University， Chengdu 610500， China； 2. Research Institute of Exploration and Development， Qinghai Oilfield Company， PetroChina， Dunhuang 736202， China
  • Online:2011-08-20 Published:2011-08-20

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Abstract:

Based on the data of sections, cores, scanning electron microscope, mercury penetration and physical properties, the characteristics and controlling factors in Qie 6 block of Kunbei Oilfield in Qaidam Basin are systematically studied. The result shows that the clastic rocks are mainly arkose, lithic arkose and feldspathic litharenite with lowcompositional maturity and moderate-high textural maturity. The primary intergranular pores are the main reservoir spaces. The pore structure is characterized by high displacement pressure, small pore throat radius, poor connection and poor sorting. As low-porosity and low-permeability reservoir, it is mostly controlled by sedimentary microfacies and diagenesis such as compaction, cementation and dissolution, amongwhich compaction dominates when the depth increases to some extent.

Key words: outcrop section, Yanchang Formation, sandstone component, Ordos Basin

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